2
OPERATION
The operation guidelines shown in this manual represent
the relay valve based SR-7 (refer to system schematic shown
in figure 3). A quick release based valve functions similarly
to the relay valve based version with the exception that all
PARK CONTROL
PORT
SUPPLY PORT
INLET / EXHAUST
VALVE
MAIN PISTON
CONTROL PISTON
SPRING GUIDE
RETAINING RING
MAIN PISTON SPRING
SPACER
STATIC PISTON
STATIC PISTON
SPRING
O-RING
O-RING
O-RING
UPPER BODY
VALVE RETAINER
SPRING
LOWER BODY
SPRING
CHECK VALVE
GUIDE
O-RING
O-RING
DOUBLE CHECK
VALVE
O-RING
CHECK VALVE
COVER
DIAPHRAGM WASHER
RETAINING RING
VALVE SEAT
DIAPHRAGM
#10 TORX HEAD SCREW
RETAINING RING
O-RING
O-RING
EXHAUST
PORT
FIGURE 2 - SECTIONAL VIEW OF SR-7 USED IN RELAY VALVE APPLICATIONS
IN-LINE SINGLE
CHECK VALVE
SPRING
BALL CHECK
VALVE
O-RING
O-RING
O-RING
O-RING
LOWER VALVE
GUIDE
1/4-20 MACHINE
SCREWS
air delivered to spring brakes passes through the park control
port through the in-line single check valve. The quick release
style SR-7 can be easily identified by the pipe plug in the
supply port of the valve.
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